Allosaurus, meaning “different lizard” was one of the species cloned by InGen and present on Isla Nublar. Allosaurus was a theropod dinosaur from the Late Jurassic period (155 to 150 million years ago) of North America with material that has been found in Portugal and Tanzania indicating this animal was widely dispersed animal across the globe. Allosaurus was approximately 28 feet (8.5 meters) in length with some specimens growing upwards of 39 feet (12 meters) in length. It was the top predator of its day and lived along side dinosaurs such as Stegosaurus, Brachiosaurus, Apatosaurus, Camarasaurus, and Ceratosaurus.
The Allosaurus most likely inhabited the restricted zone on Isla Nublar up until the 2015 incident involving the Indominus Rex, and subsequent shut down of the Jurassic World resort. One was briefly seen during the eruption of Mount Sibo as Claire Dearing and Franklin Webb attempted to escape the blast wave of the volcano’s eruption inside the Gyrosphere. However, it was then likely killed by the blast radius of a large piece of volcanic debris, landing right beside the animal. Another “juvenile” specimen was later seen being auctioned off by Gunnar Eversoll at the Lockwood Estate as part of the animals captured by Eli Mills and Ken Wheatley. It or another specimen was later seen again being transported inside one of a convoy of trucks traveling though Monument Valley, Utah.